Drilling And Blasting - Study Mode

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[#166] A mine is not considered to be adequately ventilated if the fire damp percentage in General body of the return air exceeds . . . . . . . .

(A) 0.75

(B) 1.25

(C) 1.75

(D) 0.57

Correct Answer

(A) 0.75

[#167] The maximum width of roadway permitted by law.

(A) 3 m

(B) 4.2 m

(C) 4.8 m

(D) 4.5 m

Correct Answer

(C) 4.8 m

[#168] As per mining engineers rule, minimum radius of shaft pillar for shallow shaft.

(A) 12 m

(B) 16 m

(C) 18

(D) 20 m

Correct Answer

(C) 18

[#169] No part of highwall slope of reclaimed overburden should not exceed angle is

(A) 45°

(B) 60°

(C) 55°

(D) 40°

Correct Answer

(A) 45°

[#170] The explosive which produce flame of long duration after blasting, burning particles remain contact with surround atmosphere

(A) Gun powder

(B) ANFO

(C) NG

(D) Slurry

Correct Answer

(A) Gun powder